Lincoln's Secret Service activity 150 years ago shows sophistication

It's a tale of presidential secrecy and disguise. And it's all true.

Jason Buttrill, Glenn Beck's chief researcher, takes viewers on a 150-year-old journey into the fascinating intricacies of protecting President Abraham Lincoln, especially from death threats.

"So, this story is part Clint Eastwood, wild western movie and part Jason Bourne, to set the scene," Buttrill says.

If one has forgotten about who Allen Pinkerton is from his or her history studies, or perhaps the importance of Pinkerton's Secret Service-type role in history, then an owning-agent of a private security agency, this clip is an ideal opportunity to catch up, reignite your interest.